by Kastro
Paper/Archive/CVE-2026-61568

CVE-2026-61568

zereight gitlab-mcp — @zereight/mcp-gitlab: DNS rebinding reaches local Streamable HTTP MCP transport

EPSS 0.5%CVSS 9.6
critical.is priorityof 100
38
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 45.0.450 × 209.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Versions prior to 2.1.30 expose the Streamable HTTP MCP endpoint without an effective Host or Origin allowlist. A malicious web page can use DNS rebinding to route browser requests to a victim's local MCP listener while preserving an attacker-controlled `Host` and `Origin`. The server accepts those headers and reaches the MCP initialization path instead of rejecting the request at the HTTP boundary. Version 2.1.30 contains a patch.

Affected

ProductAffectedFixed inSource
gitlab-mcp< 2.1.30–CNA

Scores by source

GitHub_M (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/zereight/gitlab-mcp/security/advisories/GHSA-vmp7-252j-cwp7refgithub.com/zereight/gitlab-mcp/pull/555refgithub.com/zereight/gitlab-mcp/commit/52207c6f5c0e7a39e9235d491225edbb562a0290refgithub.com/zereight/gitlab-mcp/releases/tag/v2.1.30